XE (with the Coil spring rear is) is the same as XF, EA.
With the EB onward, there are small changes. Lower control arm bush is wider on the EB housing, but the bushes can be changed to suit accordingly.
Also, the connection's to the tail shaft may vary.
Everything up to EA used the old U bolt connection, but the EB onward had the 4 bolt flange connection. The easiest way to overcome this difference is to install a EB tail shaft, they range from $20-50 S/H, but is a worthwhile upgrade.

Also the brake flange on the end of the tubes (where the brake adaptor mounts) is different.. Best thing to do there is use the brakes that came with the diff.. ie, ED Diff / rear brakes, onto the XF.. hook up your handbrake, and brake lines..

And of course, as they said, the tailshaft has a different flange, and if you get a ED 4 Speed auto tailshaft, you will give yourself a bigger uprated tailshaft compared to the xf one.

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